1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                             E X P _ V F P T                              --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 1992-2012, Free Software Foundation, Inc.         --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
17-- for  more details.  You should have  received  a copy of the GNU General --
18-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
19-- http://www.gnu.org/licenses for a complete copy of the license.          --
20--                                                                          --
21-- GNAT was originally developed  by the GNAT team at  New York University. --
22-- Extensive contributions were provided by Ada Core Technologies Inc.      --
23--                                                                          --
24------------------------------------------------------------------------------
25
26--  This package contains specialized routines for handling the expansion
27--  of arithmetic and conversion operations involving Vax format floating-
28--  point formats as used on the Vax and the Alpha and the ia64.
29
30with Types; use Types;
31with Uintp; use Uintp;
32
33package Exp_VFpt is
34
35   procedure Expand_Vax_Arith (N : Node_Id);
36   --  The node N is an arithmetic node (N_Op_Abs, N_Op_Add, N_Op_Sub,
37   --  N_Op_Div, N_Op_Mul, N_Op_Minus where the operands are in Vax float
38   --  format. This procedure expands the necessary call.
39
40   procedure Expand_Vax_Comparison (N : Node_Id);
41   --  The node N is an arithmetic comparison node where the types to be
42   --  compared are in Vax float format. This procedure expands the necessary
43   --  call.
44
45   procedure Expand_Vax_Conversion (N : Node_Id);
46   --  The node N is a type conversion node where either the source or the
47   --  target type, or both, are Vax floating-point type.
48
49   procedure Expand_Vax_Foreign_Return (N : Node_Id);
50   --  The node N is a call to a foreign function that returns a Vax float
51   --  value in a floating point register. Wraps the call in an asm stub
52   --  that moves the return value to an integer location on Alpha/VMS,
53   --  noop everywhere else.
54
55   function Get_Vax_Real_Literal_As_Signed (N : Node_Id) return Uint;
56   --  Get the Vax binary representation of a real literal whose type is a Vax
57   --  floating-point type. This is used by gigi. Previously we expanded real
58   --  literal to a call to a LIB$OTS routine that performed the conversion.
59   --  This worked correctly from a funcional point of view, but was
60   --  inefficient and generated huge functions for aggregate initializations.
61
62   procedure Expand_Vax_Valid (N : Node_Id);
63   --  The node N is an attribute reference node for the Valid attribute where
64   --  the prefix is of a Vax floating-point type. This procedure expands the
65   --  necessary call for the validity test.
66
67end Exp_VFpt;
68